In Firefox, whenever we download a file, a window opens up showing the progress of the file transfer, Also displays the files that are downloaded already,
The Download utility provides an option to clear the list , lets say you clear the list by clicking on the clear list button, If you do this accidentally , you would need the file names that are downloaded already.
Well, there is a way to find out these downloaded file names even after the list is cleared
Open Firefox, go to Firefox->History->Show All History
Then Select the Downloads option from the left pane, You can all the downloads on the right side.